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Tuning the physicochemical features of titanium oxide nanomaterials by ultrasound: Elevating photocatalytic selective partial oxidation of lignin-inspired aromatic alcohols

2023-01-21

Abstract


The research for green” and economically feasible approaches such as (photo)catalysis especially for biomass valorization such as selective oxidation of biomass derived compounds like aromatic alcohols to corresponding aldehyde by avoiding the harsh reaction conditions and the addition of reagents concentrate the focus of attention the last years. Hence, design and development of novel photocatalyst for the partial selective oxidation is highly desirable. In this research work, ultrasonication of different frequencies (22, 40, 80 kHz) and different amplitudes was utilized as synthesis tool in order to obtain novel materials by precipitation method.


The synthesized samples were characterized by using different techniques such as N2 sorption, TEM, XPS, XRD, thermal analysis, and diffuse reflectance absorption. The synthesized sample by using low ultrasound frequency (22 kHz) and amplitude showed a mixed morphological and structural nature consisting of asymmetric 1-dimensional (nanorods-like), layered nano-structures and not well-defined areas, leading to elevate for metal oxide specific surface areas up to 155 m2/​g. The observed 1-D nanostructures have size in the range of 20 – 60 nm.


This sample revealed the highest photo-oxidation efficiency for the selective conversion of benzyl alcohol and cinnamyl alcohol to benzaldehyde and cinnamyl aldehyde, respectively, and hence the enhanced yield towards the desired aldehydes. Even after 5 photocatalytic cycles, the selective photo-oxidation activity was retained while no leaching of Ti was recorded.

by Abdul Qayyum, Dimitrios A.Giannakoudakis, Dariusz Łomot, Ramón Fernando Colmenares-Quintero, Alec P. LaGrow, Kostiantyn Nikiforow, Dmytro Lisovytskiy, Juan Carlos Colmenares. Ultrasonics Sonochemistry (2023), 106306.

DOI: 10.1016/j.ultsonch.2023.106306
First published: 21 January 2023
 

OPEN ACCESS — article link:

https://​doi​.org/​10​.​1016​/​j​.​u​l​t​s​o​n​c​h​.​2023​.​106306

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